From: Alexander Turenko <alexander.turenko@tarantool.org> To: Konstantin Osipov <kostja.osipov@gmail.com> Cc: tarantool-patches@dev.tarantool.org Subject: Re: [Tarantool-patches] [PATCH 1/2] box: make box.cfg idempotent function Date: Wed, 6 May 2020 14:17:06 +0300 [thread overview] Message-ID: <20200506111706.m6vxgduyaa3ay3mr@tkn_work_nb> (raw) In-Reply-To: <20200319071920.GA3227@atlas> > > However you might suggest another fix for the issue? There are several > > other ways to indicate whether box is configured, e.g. introduce the > > specific value to the box table. What do you think? > > Why not set a lua variable *from* C instead of calling from Lua > *into* C each time? This way it will be slower when called from C. Since we unable to 'unconfigure' box I would just cache C's value in Lua. C's box_is_configured() is used only in box.session.su() and its performance is not so critical as box.execute(). However I don't see a reason to slowdown C's box_is_configured()() if we can avoid it: it may be important if it will be called from some other code. I don't sure, but storing database settings and state in Lua looks a bit lopsided approach for me: even now we have three languages: C, Lua and SQL. Some caching, hovewer, is okay. > I mean, this is an obvious optimization, but it is only worth it > if there is a measurable slowdown (which I suspect there is, at > least a couple of %, but even a couple of % IMHO justify it). I failed to obtain stable results and maybe there is a difference, but I don't see it now. https://gist.github.com/Totktonada/407855389ed4da93bf0175cf8a11c7b9 I made those measurements on fixed CPU frequency and 10 times run each implementation 10 times: 300 runs at whole. I see that results becomes worse for all implementations from run to run. Looks strange. WBR, Alexander Turenko.
next prev parent reply other threads:[~2020-05-06 11:17 UTC|newest] Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-14 11:50 [Tarantool-patches] [PATCH] box.execute should be immutable function Maria 2019-11-14 16:51 ` Nikita Pettik 2019-12-17 14:39 ` Igor Munkin 2019-12-24 15:32 ` [Tarantool-patches] [PATCH] box: make box.execute() immutable Maria Khaydich 2019-12-25 1:30 ` Igor Munkin 2019-12-26 14:08 ` Alexander Turenko 2020-01-13 12:13 ` Maria Khaydich 2020-01-13 15:48 ` Igor Munkin 2020-01-18 10:56 ` Maria Khaydich 2020-02-20 17:51 ` Alexander Turenko 2020-02-20 21:15 ` Igor Munkin 2020-03-11 15:56 ` Maria Khaydich 2020-03-18 22:25 ` Igor Munkin 2020-05-02 14:52 ` Alexander Turenko 2020-05-12 16:16 ` Alexander Turenko 2020-03-11 15:57 ` [Tarantool-patches] [PATCH 1/2] box: make box.cfg idempotent function Maria Khaydich 2020-03-12 13:29 ` Konstantin Osipov 2020-03-12 19:25 ` Maria Khaydich 2020-03-12 20:00 ` Konstantin Osipov 2020-03-18 22:26 ` Igor Munkin 2020-03-19 7:19 ` Konstantin Osipov 2020-03-19 9:08 ` Igor Munkin 2020-03-19 10:06 ` Konstantin Osipov 2020-03-19 10:26 ` Igor Munkin 2020-05-06 11:17 ` Alexander Turenko [this message] 2020-05-06 11:49 ` Konstantin Osipov 2020-05-06 12:53 ` Alexander Turenko 2020-05-06 13:02 ` Konstantin Osipov 2020-05-06 13:13 ` Alexander Turenko 2020-03-18 22:26 ` Igor Munkin 2020-05-12 16:17 ` Alexander Turenko
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